Heating apparatus



FIG. 1 is a front perspective view showing the new design;

FIG. 2 is a front elevation view thereof;

FIG. 3 is a side elevation view thereof, the opposite side being a mirror image;

FIG. 4 is a top plan view thereof;

FIG. 5 is a bottom plan view thereof; and,

FIG. 6 is a rear elevation view thereof.

The broken lines showings of the grille pattern, the tank and stand are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a heating apparatus, as shown and described. 